Merging pretreatment method of subcarriers in multi-input multi-output system

Abstract

The invention relates to a subcarrier-merging and pretreating method of in a multi-input multi-output system in the technical field of mobile communication, comprising the following steps of: acquiring the channel information of each subcarrier in the current moment; acquiring the average channel information Havg from the first subcarrier to the Lth subcarrier; confirming whether the layer numberK for sending data x is 1 or 2; selecting a pretreatment matrix codebook to acquire a weight coefficient of a pretreatment matrix with the row number of NT and the column number of K; using a pretreatment matrix with the maximum weight coefficient as a shared pretreatment matrix from the No. 1 subcarrier to the No. L subcarrier; continuously repeating the steps to acquire the pretreatment matrices of all the subcarriers; and mapping the products of the channel information and the pretreatment matrix of each subcarrier to NT sending antennae so as to finish information emission. The invention makes a compromise on the characteristics and the computational complexities of the L subcarriers, greatly lowers the computational complexities on the premise of keeping the system performance and has strong suitability.

Description

technical field [0001] The invention relates to a method in the technical field of mobile communication, in particular to a method for combining and preprocessing subcarriers in a multiple-input multiple-output system. Background technique [0002] The MIMO (Multi-Input Multi-Output, Multiple Input Multiple Output) technology is widely used in the new generation of mobile communication systems. The preprocessing technology is a necessary link to realize closed-loop MIMO and improve system performance. When there are N in the MIMO system T root transmit antenna and N R root receiving antenna, there are K data streams to be transmitted (K≤N T ) to be sent out, the transmitted data x needs to be multiplied with a preprocessing matrix W to be mapped to N T on the root transmitting antenna, and then transmit out. In order to improve the performance of the system, the preprocessing matrix W needs to be designed according to the channel information of the system. In a frequen...

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Problems solved by technology

[0004] After searching the existing documents, it is found that the Chinese patent application number is: 200810116917.2, and the name is: method, equipment and system for selecting precoding matrix in multiple input and multiple output systems. This technology provides three methods: the first method It is to directly feed back the preprocessing matrix corresponding to the first subcarrier among the L subcarriers. The second method is to find the preprocessing matrix on each subcarrier, and then select the preprocessing matrix with the most occurrences. The third method is Find the expected preprocessing matrix on each subcarrier, and then select a preprocessing matrix with the smallest sum of Euclidean distances from the codebook and the L expected preprocessing matrices, but the above three methods have the following defects: The first method It cannot reflect the characteristics of L subcarriers well, so it will reduce the system energy of the system; the second method needs to calculate the preprocessing matrix L times, and the computational complexity is very high, which is L times that of the first method; the third method requires Calculate L expected matrices, and traverse the sum of Euclidean distances between each matrix in the codebook and L expected matrices, the calculation is more complicated

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